I stayed at this condo for a few weeks and it's a really nice place to stay. The room is peaceful, comfortable, and has everything you need for a longer stay. The swimming pool and gym areas are great and never get busy or crowded. The location is fantastic, being right next to the BTS station and a short walk from the popular W District night beer garden. So it's a lovely area to stay in Bangkok that gives you easy access to most places you'd want to go.
Also Alex is a really great host and replies almost instantly to any questions or problems you may encounter. So nothing will be too much trouble for him.
The only downsides I could find were the living area in the room doesn't get much natural light during the day (the bedroom has the big windows), and the kitchen area doesn't have much prepping space if you want to cook. But there's no reason to cook big meals at home when there is so much delicious Thai food to enjoy just outside the front door!
Would have no hesitation to stay here again on my next trip to Bangkok.